Optimization Configuration of Grid-Connected Inverters to Suppress Harmonic Amplification in a Microgrid

Xing Sun, Wanjun Lei, Yuqi Dai, Yilin Yin and Qian Liu
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Xing Sun: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Wanjun Lei: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Yuqi Dai: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Yilin Yin: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Qian Liu: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Energies, 2022, vol. 15, issue 14, 1-15

Abstract: This paper provides insight into the optimal configuration scheme of the grid-connected inverters based on harmonic amplification suppression. The connection of the inverters changes the natural resonance frequencies of the grid. Hence, a reasonable configuration of grid-connected inverters can optimize the impedance distribution and shift the natural resonance frequencies to frequency bands farther away from the harmonic sources. We proposed a scheme of site selection and determination of the number of inverters to suppress harmonic amplification. The resonance frequencies and modal frequency sensitivities (MFSs) were obtained by the resonance modal analysis (RMA). Moreover, the concepts of security region and insecurity region of resonance frequency were illustrated. The grid-connected sites can be obtained by calculating the participation factors (PFs) of the resonance frequencies in the insecurity region. Furthermore, the optimal number was determined by building the Norton equivalent circuit of the inverter and evaluating the output impedance at each frequency. Finally, simulations in Matlab/Simulink based on a modified IEEE-9 bus microgrid were utilized to verify the effectiveness of the proposed scheme.

Keywords: grid-connected inverters; harmonic amplification; impedance distribution; resonance modal analysis (RMA); optimization; output impedance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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